Coat color in mice is determined by the C gene. CC homozygotes and Cc heterozygotes have
black coats, whereas cc homozygotes have white coats. To explore the influence of these
alleles on selection you perform three experiments. Cc heterozygous mice are introduced to
three different islands:
?
Island A: Consists of primarily white sand and has cats
Island B: Consists of primarily black sand and has cats
Island C: Consist of primarily white sand and does not have any cats or other predators.
You proceed to monitor the frequency of the C allele on all three islands over time with the
following results shown below.
Experiment #1:
0.8
Fraction of 0.6
C allele (p) 0.4
0.2
Experiment #2:
0.8
Fraction of 0.6
C allele (p) 0.4
0.2
Experiment #3:
0.8
Fraction of 0.6
C allele (p) 0.4
0.2
20
40
60
80
Generations
T
20
40
60
80
Generations
20
40
60
80
Generations
Predict which island each experiment likely occurred on. Explain your reasoning.
Experiment #1:
Experiment #2:
Experiment #3:
